The comprehensiveutilization unit of high ammonia-nitrogen wastewater of SINOPEC Catalyst Co.,Ltd. was handed over 115 days ahead of the schedule. This unit is of largescale installation in China adopting the similar environmentally-friendlyproduction process . It can purify the wastewater with ammonia-nitrogencontents of 2,000mg/L water in full compliance with the national Class-Idischarge requirement. Therefore it can be used to recycle ammonium sulfate, ammoniaand other products to achieve comprehensive utilization of sewage and hazardoussubstances.